<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 块1的周围的margin为10px -->
<span style="margin: 10px">块1</span>
<!-- 块2的周围的margin为-30px，这样会导致块2向左偏移，从而导致重叠-->
<span style="margin: -30px">块2</span>
</body>
</html>